JPWO2016009550A1 - Map display system and map display method - Google Patents

Abstract

Based on the map information acquired from the map DB (21), the viewpoint setting unit (11) sets a viewpoint for viewing the ground surface on the map when displaying a map of the setting area. The map DB (21) stores altitude information indicating the altitude of the terrain existing in at least a part of the setting area. The viewpoint setting unit (11) changes the line-of-sight direction of the viewpoint when altitude information exists in the map DB (21) at a position on the map set corresponding to the position indicated by the input position information. The viewpoint is set at a position higher than the altitude of the terrain indicated by the altitude information of the position on the map. The display processing unit (12) generates display data for displaying a map on the display device (22) when the ground surface is viewed from the viewpoint set by the viewpoint setting unit (11).

Description

  The present invention relates to a map display system and a map display method.

  In a three-dimensionally drawn map, symbols representing terrain such as mountains and vehicles are drawn with polygonal map elements called polygons. In the navigation apparatus, a polygon (hereinafter also referred to as “own vehicle polygon”) representing a vehicle (hereinafter also referred to as “own vehicle”) on which the own device is mounted is viewed from a higher position behind the own vehicle polygon. The display method of displaying in the form looked down from is used.

  In this display method, when the vehicle passes through a terrain higher than the position of the viewpoint, for example, a tunnel formed in a mountain, the vehicle polygon is included in a polygon representing the terrain (hereinafter sometimes referred to as “terrain polygon”). There is a problem of hiding.

  Techniques for avoiding this problem of the prior art are disclosed in, for example, Patent Documents 1 to 5. For example, in the technique disclosed in Patent Document 1, the problem of the prior art is avoided by using a means for setting the altitude of the viewpoint to a place higher than the altitude of the components of the map.

JP-A-10-143066 JP 2006-145680 A JP 2002-181562 A JP 2008-14754 A JP 2004-361112 A

  The technologies disclosed in Patent Documents 1 to 5 are based on the premise that the host vehicle is traveling on the surface of the terrain, and the position of the viewpoint when traveling through the tunnel is not considered.

  Therefore, for example, when the vehicle passes through a tunnel formed on a terrain such as a mountain that is higher than the position of the viewpoint, the viewpoint enters the terrain polygon representing the mountain, and an unnecessary image inside the terrain polygon is generated. It is displayed and the problem that the appearance of a map worsens arises.

  An object of the present invention is to provide a map display system and a map display method capable of preventing an unnecessary image inside a map component representing terrain from being displayed on a map and displaying a good-looking map. is there.

  The map display system of the present invention acquires map information of a set area set corresponding to a position indicated by input position information from a map database, and displays a map of the set area based on the acquired map information. A viewpoint setting unit that sets the viewpoint for viewing the ground surface on the map, and display data for displaying the map of the set area when the ground surface is viewed from the viewpoint set by the viewpoint setting unit. The map database stores altitude information indicating the altitude of the terrain existing in at least a part of the setting area, and the viewpoint setting section corresponds to the position indicated by the input position information. If the altitude information exists in the map database at the position on the map set in this way, the location indicated by the altitude information at the position on the map can be changed by changing the viewing direction of the viewpoint. A position higher than the altitude, and sets a view point.

  The map display method of the present invention acquires map information of a setting area set corresponding to a position indicated by input position information from a map database, and displays a map of the setting area based on the acquired map information. A map display method for generating a display data for displaying a map of a set area when a ground surface is sometimes viewed on a map and a ground surface is viewed from a set viewpoint. In the map database, altitude information indicating the altitude of the terrain existing in at least a part of the setting area is stored, and the altitude information at the position set on the map corresponding to the position indicated by the input position information is stored. If the information exists in the map database, set the viewpoint at a position higher than the altitude of the terrain indicated by the altitude information of the position on the map by changing the viewing direction of the viewpoint And wherein the Rukoto.

  According to the map display system of the present invention, altitude information indicating the altitude of the terrain existing in at least a part of the setting area set corresponding to the position indicated by the input position information is stored in the map database. . When the altitude information exists in the map database at the position on the map set corresponding to the position indicated by the input position information, the viewpoint setting unit changes the viewpoint direction of the viewpoint, The viewpoint is set at a position higher than the altitude of the terrain indicated by the position altitude information. Display data for displaying on the display device a map of the set area when the ground surface is viewed from the viewpoint set by the viewpoint setting unit is generated by the display processing unit. As a result, for example, when a vehicle passes through a terrain higher than the position of the viewpoint, for example, a tunnel formed in a mountain, the viewpoint of the map including the vehicle enters a map component representing the terrain such as a mountain. Can be prevented. Therefore, it is possible to prevent an unnecessary image inside the map component representing the terrain from being displayed on the map, and thus it is possible to display a good-looking map.

  According to the map display system of the present invention, altitude information indicating the altitude of the terrain existing in at least a part of the setting area set corresponding to the position indicated by the input position information is stored in the map database. . When altitude information exists in the map database at a position set in correspondence with the position indicated by the input position information, the gaze direction of the viewpoint is changed so that the altitude information of the position on the map The viewpoint is set at a position higher than the altitude of the displayed terrain. Display data for displaying a map of the set area when the ground surface is viewed from the set viewpoint is generated on the display device. Thus, for example, when a vehicle passes through a terrain higher than the position of the viewpoint, for example, a tunnel formed in a mountain, the viewpoint of the map including the vehicle enters a map component representing the mountain or the like. Can be prevented. Therefore, it is possible to prevent an unnecessary image inside the map component representing the terrain from being displayed on the map, and thus it is possible to display a good-looking map.

  Objects, features, aspects, and advantages of the present invention will become more apparent from the following detailed description and the accompanying drawings.

It is a block diagram which shows the structure of the map display system 1 which is the 1st Embodiment of this invention. It is a block diagram which shows the structure of the map display system 2 which is the 2nd Embodiment of this invention. It is a figure for demonstrating the viewpoint position in case the own vehicle 60 drive | works the tunnel 62 formed in the mountain 61. FIG. It is sectional drawing seen from the cut surface line IV-IV of FIG. It is a figure for demonstrating the viewpoint position in case the own vehicle 60 drive | works the tunnel formed in the mountain 63. FIG. It is a flowchart which shows the procedure of the change process of the viewpoint position in the 2nd Embodiment of this invention. It is a block diagram which shows the structure of the map display system 40 which is the 3rd Embodiment of this invention. It is a block diagram which shows the structure of the map display system 50 which is the 4th Embodiment of this invention.

<First Embodiment>
FIG. 1 is a block diagram showing a configuration of a map display system 1 according to the first embodiment of the present invention. The map display system 1 according to the present embodiment is realized by a navigation device mounted on a vehicle. The map display system 1 includes a viewpoint setting unit 11 and a display processing unit 12. The viewpoint setting unit 11 and the display processing unit 12 are connected to a map database (hereinafter also referred to as “map DB”) 21. The display processing unit 12 is connected to the display device 22.

  The map display system 1 includes, for example, a central processing unit (abbreviation: CPU) and a memory such as a writable RAM (Random Access Memory). The memory stores a control program. Each function of the viewpoint setting unit 11 and the display processing unit 12 of the map display system 1 is realized by the CPU executing the control program stored in the memory.

  The map DB 21 is realized by, for example, a hard disk drive (abbreviation: HDD) device or a storage device such as a semiconductor memory. The map DB 21 stores map information related to the map.

  The map information is configured by hierarchizing a plurality of maps corresponding to a predetermined scale. The map information includes map display information for displaying the map as an image.

  Map display information includes road attribute information about roads, altitude information indicating the altitude of map components, polygon data indicating the scope of facilities on the map, and line data indicating line shapes such as rivers on the map And facility information representing the type, name and position of the facility, various character information representing the place name, facility name, intersection name and road name, and various icon information representing the facility and road number.

  The altitude information is information indicating the altitude of the terrain existing in at least a part of the preset setting area. The setting area is set corresponding to the position indicated by the position information input to the map display system 1.

  The viewpoint setting unit 11 acquires map information from the map DB 21 and sets a viewpoint for viewing the ground surface on the map when displaying the map based on the acquired map information. The viewpoint setting unit 11 provides the display processing unit 12 with viewpoint position information indicating the position of the set viewpoint.

  The display processing unit 12 acquires the map information from the map DB 21 and views the ground surface from the viewpoint position indicated by the viewpoint position information based on the acquired map information and the viewpoint position information given from the viewpoint setting unit 11. Display data for displaying the map of the case on the display device 22 is generated. The display processing unit 12 gives the generated display data to the display device 22.

  The display device 22 is realized by a liquid crystal display device, for example. Although not shown, the display device 22 includes a display unit that displays an image. The display device 22 displays a map based on the display data given from the display processing unit 12. Specifically, the display device 22 converts display data provided from the display processing unit 12 into an image signal that can be handled by the display device 22, and displays an image corresponding to the image information represented by the obtained image signal. Displayed on the display screen.

  The display device 22 is, for example, a display device of a mobile communication device such as a mobile phone, a smartphone, or a tablet terminal device, or a display device of a car navigation device that can be mounted on a vehicle. The display device 22 may be provided separately from a display device such as a portable communication device and a car navigation device.

  In the present embodiment, the viewpoint setting unit 11 changes the viewing direction of the viewpoint when altitude information is present in the map DB 21 at a position on the map set corresponding to the position indicated by the input position information. Thus, the viewpoint is set at a position higher than the altitude of the map component such as the terrain at the position on the map.

  Thus, for example, when a vehicle passes through a terrain higher than the position of the viewpoint, for example, a tunnel formed in a mountain, the viewpoint of the map including the vehicle enters a polygon that is a map component representing the mountain or the like. Can be prevented. Therefore, it is possible to prevent unnecessary images inside map components called polygons representing terrain and the like from being displayed, so that a good-looking map can be displayed on the display device 22.

<Second Embodiment>
FIG. 2 is a block diagram showing the configuration of the map display system 2 according to the second embodiment of the present invention. The map display system 2 includes a map drawing unit 10 and a position information acquisition unit 14. The map drawing unit 10 includes a viewpoint setting unit 11, a display processing unit 12, and a timer unit 13. A map DB 21 is connected to the map drawing unit 10 and the position information acquisition unit 14. In addition, a global positioning system (abbreviation: GPS) sensor 31, a vehicle speed sensor 32, a gyro sensor 33, and a display device 22 are connected to the map display system 2.

  The viewpoint setting unit 11 and the display processing unit 12 of the map drawing unit 10 and the map DB 21 and the display device 22 in the present embodiment are the same as the viewpoint setting unit 11, the display processing unit 12 in the first embodiment shown in FIG. Since it is the same structure as map DB21 and the display apparatus 22, the same referential mark is attached | subjected and common description is abbreviate | omitted.

  The map display system 2 according to the present embodiment is realized by a navigation device mounted on a vehicle. The GPS sensor 31, the vehicle speed sensor 32, the gyro sensor 33, and the display device 22 are mounted on the vehicle together with the map display system 2. In the following description, a vehicle on which the map display system 2, the GPS sensor 31, the vehicle speed sensor 32, the gyro sensor 33, and the display device 22 are mounted may be referred to as “own vehicle”.

  The GPS sensor 31 receives a radio signal transmitted from a GPS satellite and detects the current position of the host vehicle based on the received radio signal. The GPS sensor 31 gives current position information indicating the detected current position of the host vehicle to the map display system 2, specifically, the position information acquisition unit 14 and the map drawing unit 10 of the map display system 2.

  The vehicle speed sensor 32 detects the traveling speed of the host vehicle (hereinafter sometimes referred to as “vehicle speed”). The vehicle speed sensor 32 provides vehicle speed information representing the detected vehicle speed, specifically, a vehicle speed pulse signal to the map display system 2, specifically, the position information acquisition unit 14 and the map drawing unit 10 of the map display system 2.

  The gyro sensor 33 is an angular velocity sensor and detects the angular velocity of the host vehicle. The gyro sensor 33 generates angular velocity information representing the detected angular velocity of the host vehicle, and provides the map display system 2, specifically, the position information acquisition unit 14 and the map drawing unit 10 of the map display system 2.

  The timer unit 13 measures the passage of relative time. The timer unit 13 is realized by, for example, a counter that counts an elapsed time from the time when the time measurement is started.

  In this Embodiment, the map display system 2 is comprised so that map information may be acquired from map DB21, However, it is not restricted to such a structure. The map display system 2 may be configured to acquire all or part of the map information from the outside of the host vehicle, for example, by communication. Specifically, the map display system 2 may be configured to acquire map information by downloading it from a server device outside the host vehicle via a communication network such as the Internet. The acquired map information is given to the position information acquisition unit 14 and the map drawing unit 10.

  The position information acquisition unit 14 and the map drawing unit 10 are respectively output from the current position information output from the GPS sensor 31 and the vehicle speed sensor 32 via an in-vehicle network such as an in-vehicle LAN (Local Area Network) not shown. Vehicle speed information and angular velocity information output from the gyro sensor 33 are acquired.

  The position information acquisition unit 14 is based on the current position information given from the GPS sensor 31, the vehicle speed information given from the vehicle speed sensor 32, and the angular velocity information given from the gyro sensor 33. (Hereinafter sometimes referred to as “own vehicle location”). The position information acquisition unit 14 generates own vehicle point information representing the obtained own vehicle point.

  Further, the location information acquisition unit 14 acquires road attribute information included in the map information from the map DB 21. The position information acquisition unit 14 compares the generated own vehicle location information with the road attribute information acquired from the map DB 21 and detects a road where the own vehicle location exists. The position information acquisition unit 14 generates own vehicle point road information representing the detected road, and gives the generated own vehicle point road information to the map drawing unit 10.

  The map drawing unit 10 acquires road attribute information included in the map information from the map DB 21. The road attribute information includes a tunnel flag indicating whether or not the road represented by the road attribute information is a tunnel. The map drawing unit 10, specifically, the viewpoint setting unit 11 uses the tunnel flag included in the road attribute information to determine whether or not the road where the vehicle position exists is a tunnel.

  When the host vehicle is traveling in a tunnel, the viewpoint setting unit 11 calculates the viewpoint position as described later, and combines the calculated viewpoint position as the viewpoint position of the background map generated by the display processing unit 12. To the display device 22.

  FIG. 3 is a diagram for explaining the viewpoint position when the host vehicle 60 travels through the tunnel 62 formed in the mountain 61. FIG. 4 is a cross-sectional view taken along section line IV-IV in FIG.

  The position before the own vehicle 60 enters the tunnel 62 is “CP1”, the position where the own vehicle 60 is traveling through the tunnel 62 is “CP2 ′”, and the position after the own vehicle 60 has passed through the tunnel 62 is “CP2”. Show. In addition, the reference positions in the horizontal direction of the respective viewpoint positions C1, C2 ', and C2 (hereinafter sometimes referred to as "reference positions") are indicated by "BP1", "BP2'", and "BP2".

  When the host vehicle 60 is at the position CP1 before entering the tunnel 62, the viewpoint position is at a position C1 that is predetermined as a standard viewpoint position (hereinafter sometimes referred to as “standard viewpoint position”), and the viewpoint represents the mountain 61. There is no entry into the terrain polygon (hereinafter sometimes referred to as “terrain polygon 61”). As the host vehicle 60 moves to the right in the traveling direction, that is, toward the plane of FIG. 4, the viewpoint position eventually collides with the terrain polygon 61.

  In order to avoid this collision, for example, data on the height (hereinafter sometimes referred to as “altitude”) of the topographic polygon 61 on the host vehicle position CP <b> 2 ′ in the tunnel 62 is referred to from the map information. When the height L2 of the terrain polygon 61 is higher than the height L1 of the standard viewpoint position C1, the horizontal plane when the viewpoint position becomes a height that does not collide with the terrain polygon 61, for example, when the viewpoint position is C2 ′. To the viewpoint position (hereinafter also referred to as “viewpoint angle”) θ2 ′ is calculated.

  The viewpoint angle θ2 ′ at the viewpoint position C2 ′ is calculated as a value when the host vehicle 60 is positioned at the host vehicle position CP2 ′ in the tunnel 62. The viewpoint angle θ1 at the host vehicle position CP1 is calculated as the value in the tunnel 62. The timing of changing to the viewpoint angle θ2 ′ at the host vehicle position CP2 ′ is when the reference position serving as the reference for the viewpoint position has reached BP2, and the viewpoint position at that time is indicated by “C2”.

  In this case, since the viewpoint position before and after the change is located on the circumference of the same radius, the distance R between the viewpoint position and the vehicle position does not change. That is, the viewpoint is set so as to maintain a relative distance with respect to the host vehicle 60.

  FIG. 5 is a diagram for explaining the viewpoint position when the host vehicle 60 travels through a tunnel formed in the mountain 63. In FIG. 5, the position before the own vehicle 60 enters the tunnel is indicated by “CP3”, and the position where the own vehicle 60 is traveling through the tunnel is indicated by “CP4”. In addition, locations serving as references for the viewpoint positions C3 and C3 'are indicated by "BP3" and "BP4".

  In the example shown in FIG. 5 as well, as in the case shown in FIGS. 3 and 4 described above, at the viewpoint position C3, there is no problem when the host vehicle 60 is in CP3. As the sheet moves to the right side in FIG. 5, the viewpoint position eventually collides with a terrain polygon representing the mountain 63 (hereinafter sometimes referred to as “terrain polygon 63”).

  In the example shown in FIG. 5, unlike the example shown in FIG. 3, even if the viewpoint angle is changed to 90 °, that is, the viewpoint angle at the viewpoint position C <b> 3 ′ in a state of looking down from directly above, the collision with the terrain polygon 63 occurs. It cannot be avoided.

  Even if the viewpoint angle is increased to avoid this collision, the collision may not be avoided. For example, when the host vehicle 60 is at the host vehicle position CP4, a collision with the terrain polygon 63 cannot be avoided even if the viewpoint angle is 90 °. That is, it is located above the own vehicle 60 and is higher than the altitude of the terrain existing at a position on the map corresponding to the current position of the own vehicle 60 while maintaining a relative distance from the current position of the own vehicle 60 that is sequentially updated. The viewpoint cannot be set at the position.

  In this case, in order to avoid a collision with the terrain polygon 63, the viewpoint angle is set to 90 °, and the distance L3 (= R) between the viewpoint position C3 ′ and the vehicle position CP3 is extended to L4. The viewpoint position is set to a position C4 that does not collide with the terrain polygon 63.

  In this way, the relative distance between the viewpoint position and the vehicle position that is the current position of the moving object, that is, the relative distance of the viewpoint with respect to the current position of the moving object (hereinafter sometimes referred to as “viewing distance”) is changed, For example, if it becomes longer, map display objects such as the own vehicle symbol representing the own vehicle 60 on the map become smaller, and the visibility may deteriorate.

  In order to avoid the deterioration of visibility, in this embodiment, the magnification of the coefficient extended from the original viewpoint distance so as to display the map display object in the same size as before the change of the viewpoint distance, an example shown in FIG. Then, the map display object is enlarged and displayed at a magnification of L4 / L3.

  If the change in the viewpoint position as described above is performed while traveling in a tunnel on a terrain with a steep difference in height, the map may flicker with frequent changes in the viewpoint position. In order to suppress this frequent change of the viewpoint position, in this embodiment, a threshold is set for the duration of tunnel travel on terrain where the viewpoint position needs to be changed, and the change of the viewpoint position in a short time is suppressed. To do.

  FIG. 6 is a flowchart showing the procedure of the viewpoint position changing process according to the second embodiment of the present invention. The processing of each step of the flowchart shown in FIG. 6 is executed by the position information acquisition unit 14 and the map drawing unit 10 that constitute the map display system 2 shown in FIG. The process of the flowchart shown in FIG. 6 is started when the current position information updated with the movement of the host vehicle 60 is input to the map display system 2, and the process proceeds to step S1.

  In step S1, the position information acquisition unit 14 specifies the current position. Specifically, the position information acquisition unit 14 is based on the current position information given from the GPS sensor 31, the vehicle speed information given from the vehicle speed sensor 32, and the angular velocity information given from the gyro sensor 33. By obtaining the vehicle location, the current position of the host vehicle 60 is specified. The position information acquisition unit 14 generates own vehicle point information representing the obtained own vehicle point.

  The position information acquisition unit 14 acquires road attribute information from the map DB 21, compares the vehicle location information generated in step S 1 with the road attribute information acquired from the map DB 21, and the road where the vehicle location exists. Is detected. The position information acquisition unit 14 generates own vehicle point road information representing the detected road, and gives the generated own vehicle point road information to the map drawing unit 10.

  In step S2, the map drawing unit 10 determines whether or not the current position is in the tunnel. Specifically, the map drawing unit 10 acquires road attribute information from the map DB 21 and uses the tunnel flag included in the acquired road attribute information to determine whether or not the current position of the host vehicle 60 is in the tunnel. Determine whether. If it is determined that the current position is within the tunnel, the process proceeds to step S3. If it is determined that the current position is not within the tunnel, the process proceeds to step S4.

  In step S3, the map drawing unit 10 determines whether or not the altitude of the terrain at the current position is higher than a standard viewpoint position that is a predetermined viewpoint position. Specifically, the map drawing unit 10 acquires altitude information from the map DB 21 and determines whether or not the altitude of the terrain at the current position is higher than the standard viewpoint position based on the acquired altitude information. If it is determined that the altitude of the terrain at the current position is higher than the standard viewpoint position, the process proceeds to step S6. If it is determined that the altitude is not higher than the standard viewpoint position, that is, below the standard viewpoint position, step S4 is performed. Migrate to

  In step S4, the map drawing unit 10 initializes timer information and current position information. Next, in step S5, the map drawing unit 10 initializes the viewpoint position. When the process of step S5 ends, all processing procedures are ended.

  In step S6, the timer unit 13 determines whether there is timer information previously suspended. If it is determined that there is timer information previously suspended, the process proceeds to step S7. If it is determined that timer information previously suspended is not present, the process proceeds to step S8.

  In step S7, the timer unit 13 determines whether or not the holding time of the timer information is equal to or longer than a predetermined set time. If it is determined that the holding time of the timer information is equal to or longer than the set time, the process proceeds to step S9. If it is determined that the timer information is not equal to or longer than the set time, that is, less than the set time, the process returns to step S1.

  In step S8, the map drawing unit 10 starts measuring the holding timer, that is, the holding time of the timer information, by the timer unit 13, and stores the current position information at that time in a memory (not shown). When the process of step S8 ends, the process returns to step S1.

  In step S9, the viewpoint setting unit 11 determines whether or not the altitude of the terrain is equal to or greater than the distance from the current position of the host vehicle to the viewpoint position. When it is determined that the altitude of the terrain is equal to or greater than the distance from the current position of the vehicle to the viewpoint position, the process proceeds to step S10, and when it is determined that the altitude is not equal to or greater than the distance from the current position of the vehicle to the viewpoint position. The process proceeds to step S13.

  In step S <b> 10, the viewpoint setting unit 11 changes the viewpoint distance so that the distance from the current position of the host vehicle to the viewpoint position is greater than the altitude of the terrain. When the process of step S10 ends, the process proceeds to step S11.

  In step S11, the display processing unit 12 enlarges and displays the map according to the changed viewpoint distance. Specifically, the display processing unit 12 generates display data so as to enlarge and display the map according to the changed viewpoint distance, and gives the generated display data to the display device 22. Zoom in on the map. When the process of step S11 ends, the process proceeds to step S12.

  In step S12, the map drawing unit 10 initializes timer information and current position information. When the process of step S12 ends, all processing procedures are ended.

  In step S13, the viewpoint setting unit 11 calculates a viewpoint angle at which the viewpoint position does not intersect with the terrain as shown in FIGS. When the process of step S13 ends, the process proceeds to step S14.

  In step S <b> 14, when the drawing reference position reaches the current position indicated by the stored current position information, the display processing unit 12 displays the map at the calculated viewpoint angle by giving display data to the display device 22. When the process of step S14 ends, the process proceeds to step S15.

  In step S15, the map drawing unit 10 initializes timer information and current position information. When the process of step S15 ends, all processing procedures are ended.

  The position of the viewpoint changed as described above is restored when the host vehicle 60 passes the reference position BP2.

  As described above, according to the present embodiment, as in the first embodiment, the viewpoint setting unit 11 performs altitude at the position set on the map corresponding to the position indicated by the input position information. When the information exists in the map DB 21, the viewpoint is set at a position higher than the altitude of the map component such as the terrain at the position on the map by changing the viewing direction of the viewpoint.

  Accordingly, for example, when the host vehicle 60 passes through a terrain higher than the position of the viewpoint, for example, a tunnel formed in a mountain, the viewpoint can be prevented from entering a map component representing the mountain. Therefore, it is possible to prevent unnecessary images inside map components called polygons representing terrain and the like from being displayed, so that a good-looking map can be displayed on the display device 22.

  In the present embodiment, the position indicated by the position information input to the map display system 2 is the current position of the moving body such as the host vehicle 60. Each time the current position information updated with the movement of a moving body such as the host vehicle 60 is input to the map display system 2, the viewpoint setting unit 11 sets the viewpoint. Thereby, the viewpoint can be set at an appropriate position according to the current position. Therefore, since it is possible to prevent an unnecessary image inside the polygon from being displayed more reliably, a good-looking map can be more reliably displayed on the display device 22.

  In the present embodiment, as shown in FIG. 4, the viewpoint setting unit 11 sets the viewpoint so as to maintain a relative distance with respect to the current position where the mobile object such as the host vehicle 60 is sequentially updated. As a result, it is possible to prevent a map display object such as a host vehicle symbol representing the host vehicle 60 from being displayed small on the map, and thus it is possible to avoid deterioration in visibility.

  In the present embodiment, as shown in FIG. 5, the viewpoint setting unit 11 changes the line-of-sight direction of the viewpoint relative to the current position of the moving body such as the host vehicle 60 that is sequentially updated, thereby changing the current position of the moving body. If the viewpoint cannot be set higher than the altitude of the terrain indicated by the altitude information of the position on the map corresponding to, the relative distance from the current position of the moving object Set the viewpoint to a higher position. As a result, it is possible to more reliably prevent an unnecessary image inside the polygon from being displayed, and to display a good-looking map on the display device 22 more reliably.

  In the present embodiment, when the viewpoint setting unit 11 changes the viewpoint distance, which is a relative distance from the current position of the moving object, the display processing unit 12 changes the moving object and the moving object according to the change of the viewpoint distance. Display data is generated by enlarging or reducing the map so that the scale of the map does not change. Specifically, the map display is performed at the magnification of the coefficient extended from the original viewpoint distance so as to display the map display object in the same size as before the change of the viewpoint distance, in the example shown in FIG. 5, the magnification of L4 / L3. Display data is generated so that an object is enlarged and displayed. Thereby, it is possible to prevent a map display object such as the own vehicle symbol representing the own vehicle 60 from being displayed small on the map, and to prevent the visibility from deteriorating.

  In the present embodiment, as shown in FIG. 6, the viewpoint setting unit 11 sets the viewpoint when it is determined in step S7 that the holding time is equal to or longer than the set time. That is, the viewpoint setting unit 11 does not change the setting of the viewpoint when the time interval at which the position information updated with the movement of the moving body is input is equal to or shorter than the set time. As a result, frequent changes in the viewpoint position can be suppressed, and the appearance of flickering on the map can be suppressed.

  In the present embodiment, the process of the flowchart shown in FIG. 6 is started when the current position information updated with the movement of the host vehicle 60 is input to the map display system 2. That is, the viewpoint setting unit 11 does not change the setting of the viewpoint when the movement of the moving body such as the host vehicle 60 is stopped and the updated current position information is not input. As a result, frequent changes in the viewpoint position can be suppressed, and the appearance of flickering on the map can be suppressed.

  In the present embodiment, as shown in FIGS. 3 to 5, the topography of the mountains 61 and 63 in the mountainous region having the tunnel 62 on the road through which a moving body such as the own vehicle 60 passes is contained in the tunnel 62. When there is a road on the map corresponding to the current position of the mobile object, the viewpoint setting unit 11 sets the viewpoint. Thereby, it is possible to prevent unnecessary images inside the mountains 61 and 63 from being displayed, and to display a good-looking map on the display device 22.

<Third Embodiment>
FIG. 7 is a block diagram showing a configuration of a map display system 40 according to the third embodiment of the present invention. Since the map display system 40 of the present embodiment is similar in configuration to the map display system 2 of the second embodiment described above, the same components are denoted by the same reference numerals and are described in common. Is omitted.

  The map display system 40 of this Embodiment is implement | achieved by the server apparatus. A server device that is the map display system 40 includes a position information acquisition unit 14, a map drawing unit 10, and a map DB 21. In the present embodiment, the GPS sensor 31, the vehicle speed sensor 32, the gyro sensor 33, and the display device 22 are mounted on the vehicle. In the present embodiment, the vehicle on which the GPS sensor 31, the vehicle speed sensor 32, the gyro sensor 33, and the display device 22 are mounted corresponds to the “own vehicle” in the first embodiment described above.

  A vehicle on which these GPS sensor 31, vehicle speed sensor 32, gyro sensor 33 and display device 22 are mounted and a server device which is the map display system 40 are connected so as to be capable of wireless communication via a communication network such as the Internet. Has been. The server device that is the map display system 40 receives the current position information output from the GPS sensor 31, the vehicle speed information output from the vehicle speed sensor 32, and the angular velocity information output from the gyro sensor 33 via the communication network. Get from.

  As described above, even when the map display system 40 is realized by the server device, the same effects as those of the second embodiment described above can be obtained.

<Fourth embodiment>
FIG. 8 is a block diagram showing a configuration of a map display system 50 according to the fourth embodiment of the present invention. Since the map display system 50 of this embodiment is similar in configuration to the map display system 2 of the second embodiment described above, the same components are denoted by the same reference numerals and are described in common. Is omitted.

  The map display system 50 of the present embodiment is realized by a mobile communication device. The mobile communication device is, for example, a mobile phone, a smartphone, or a tablet terminal device. The mobile communication device that is the map display system 50 includes the position information acquisition unit 14, the map drawing unit 10, and the communication unit 51. The communication unit 51 is configured to be able to communicate with external devices such as the server device 70 and the display device 22.

  In the present embodiment, the GPS sensor 31, the vehicle speed sensor 32, the gyro sensor 33, and the display device 22 are mounted on the vehicle. In the present embodiment, the vehicle on which the GPS sensor 31, the vehicle speed sensor 32, the gyro sensor 33, and the display device 22 are mounted corresponds to the “own vehicle” in the first embodiment described above.

  The vehicle on which the GPS sensor 31, the vehicle speed sensor 32, the gyro sensor 33, and the display device 22 are mounted and the mobile communication device that is the map display system 50 are connected to each other so as to be able to perform wireless communication via a base station, for example. Yes. The mobile communication device which is the map display system 50 receives the current position information output from the GPS sensor 31, the vehicle speed information output from the vehicle speed sensor 32, and the angular velocity information output from the gyro sensor 33 via the base station. Obtain from the vehicle.

  The mobile communication device that is the map display system 50 and the server device 70 are configured to be able to communicate with each other via a communication network such as the Internet. The server device 70 includes a map DB 21. The map display system 50 according to the present embodiment acquires map information from the map DB 21 of the server device 70 via a communication network such as the Internet.

  Thus, even when the map display system 50 is realized by a portable communication device, the same effect as that of the second embodiment described above can be obtained.

  The present invention can be freely combined with each embodiment within the scope of the invention. In addition, any component in each embodiment can be changed or omitted as appropriate.

  Although the present invention has been described in detail, the above description is illustrative in all aspects, and the present invention is not limited thereto. It is understood that countless variations that are not illustrated can be envisaged without departing from the scope of the present invention.

  1, 2, 40, 50 Map display system, 10 Map drawing unit, 11 Viewpoint setting unit, 12 Display processing unit, 13 Timer unit, 14 Location information acquisition unit, 21 Map DB, 22 Display device, 31 GPS sensor, 32 Vehicle speed Sensor, 33 Gyro sensor, 51 Communication unit, 70 Server device.

Claims (9)

The map information of the setting area set corresponding to the position indicated by the input position information is acquired from the map database, and the map of the setting area is displayed on the map based on the acquired map information. A viewpoint setting unit for setting a viewpoint for viewing the ground surface;
A display processing unit that generates display data for displaying a map of the setting area when the ground surface is viewed from the viewpoint set by the viewpoint setting unit;
The map database stores altitude information indicating altitude of terrain existing in at least a part of the setting area;
The viewpoint setting unit includes:
When the altitude information is present in the map database at a position set on the map corresponding to the position indicated by the input position information, the position on the map is changed by changing the viewing direction of the viewpoint. A map display system characterized in that the viewpoint is set at a position higher than the altitude of the terrain indicated by the altitude information. The position indicated by the input position information is a current position of the moving object,
The map display system according to claim 1, wherein the viewpoint setting unit sets the viewpoint every time the position information updated with the movement of the moving body is input. The viewpoint setting unit includes:
The map display system according to claim 2, wherein the viewpoint is set so as to maintain a relative distance with respect to a current position of the moving body that is sequentially updated. The viewpoint setting unit includes:
A position higher than the altitude of the terrain indicated by the altitude information of the position on the map corresponding to the current position of the moving body by changing the line-of-sight direction of the viewpoint with respect to the current position of the moving body that is sequentially updated The viewpoint may be set at a position higher than the altitude of the terrain by changing a relative distance from the current position of the moving body when the viewpoint cannot be set in the position. The map display system described in 1. The display processing unit
When the viewpoint setting unit changes the relative distance to the current position of the mobile object, the map is enlarged or reduced so that the scale of the mobile object and the map does not change with the change of the relative distance. The map display system according to claim 4, wherein the display data is generated. The viewpoint setting unit includes:
The setting of the viewpoint is not changed when a time interval in which the position information updated with the movement of the moving body is input is equal to or shorter than a predetermined setting time. Map display system. The viewpoint setting unit includes:
3. The map display system according to claim 2, wherein when the movement of the moving body stops and the updated position information is not input, the setting of the viewpoint is not changed. The terrain includes a mountain terrain of a mountainous area having a tunnel on a road through which the mobile body passes,
The map display according to claim 2, wherein the viewpoint setting unit sets the viewpoint when the road is in the tunnel at a position on a map corresponding to a current position of the moving body. system. The map information of the setting area set corresponding to the position indicated by the input position information is acquired from the map database, and the map of the setting area is displayed on the map based on the acquired map information. A map display method for generating display data for displaying a map of the setting area when a viewpoint for viewing the ground surface is set and the ground surface is viewed from the set viewpoint.
In the map database, altitude information indicating altitude of terrain existing in at least a part of the setting area is stored,
When the altitude information is present in the map database at a position set on the map corresponding to the position indicated by the input position information, the line of sight of the viewpoint is changed to change the position on the map. A map display method characterized in that the viewpoint is set at a position higher than the altitude of the terrain indicated by the altitude information of the position.

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